478 Mr. R. Etheridge, Jun., on the Gasteropoda 



Euomphalus acutus, De Koninck, Animaux Foss. p. 433, t. 24. fig. 7, 



a, b. 

 Straparottus acutus, M'Coy, Brit. Pal. Foss. 1853, fasc. 3, p. 537. 

 Euomphalus acutus, &c, Morris, Cat. Brit. Foss. ed. 2, 1854, p. 247. 

 Cirrus tabulatus, J. de C. Sow. Min. Conch. 1844, vii. p. 65, t. 638. 



fig. 2 (excl. figs. 3, 4). 



8. Cirrus tabulatus, Phillips (p. 225, t. 13. fig. 7). 



This figure is an improvement on the original, which is 

 not quite so mathematically precise as the illustration repre- 

 sents it. It is, further, a small example of C. tabulatus, which 

 at times grows to a very large size. Prof. M'Coy's remarks 

 on this species are very much to the point ; and he refers with 

 great distinctness to the chief character, next to its tabulate 

 whorls, viz. the truncation of the spire. I quite agree with 

 M'Coy as to the resemblance borne by C. tabulatus to the 

 variety of Euomphalus pentangulatus with the centre whorls 

 somewhat elevated above, instead of depressed below, the mar- 

 ginal keel of the body-whorl. Under the name of Euomphalus 

 tabulatus, Phill, Trautschold has figured* a shell in no way 

 agreeing with the true characters of the species. It is there 

 represented as a planorbicular biconcave shell (at any rate 

 more or less so), whereas in reality E. tabulatus has an ele- 

 vated spire with large tabulate whorls. 



There should be no mistaking this species after the figure 

 of the fine specimen in the Gilbertson collection given by 

 Mr. J. de C. Sowerby. E. tabulatus will, I believe, form the 

 European type of Meek's subgenus Omphalotrochus. It 

 is the 



Cirrus tabulatus, Phillips, loc. cit. 



Euomphalus tabulatus, M'Coy, Synop. Carb. Limest. Foss. 1844, p. 38. 

 Straparollus tabulatus, M'Coy, Brit. Pal. Foss. 1853. fasc. 3, p. 541. 

 Cirrus tabulatus, J. de C. Sow. Min. Conch. 1844, vii. p. 65, t. 638. 

 fig. 1 (excl. figs. 2-4). 



9. Cirrus pentagonalis, Phillips (p. 226, t. 14. fig. 8). 



I have already expressed my concurrence with Prof, de 

 Koninck in regarding this as probably the immature form of 

 C. acutus. The figured specimen is easily to be recognized 

 by the fracture above the mouth on the body- whorl. 



10. Cirrus rotundatus, J. Sowerby (Phillips, p. 226, t. 13. 



fig. 15). 



With the outward form of C. acutus, to a great extent, this 



species is distinguished, as originally pointed ou by Mr. 



Sowerby, by having the upper part of each whorl rounded 



* Die Kalkbruche von Mjatschkowa, 1874, pt. i. t. 4. fig. 12, a, b, c. 



